Excerpt from Qualitative Chemical Analysis: A Guide in Qualitative Work, With Data for Analytical Operations and Laboratory Methods in Organic Chemistry

Since the last revision of this very comprehensive text on Qualitative Analysis was issued, a considerable number of new methods of analysis have been published, and some of these have been found to be valuable and have come into more or less general use.

Many of the new methods have been tried out and some have been found to be unreliable unless extreme care is taken or only pure solutions used. The attempt has been made to include in this revision only those methods which have been found to be reliable.

A very marked change has also taken place in the method of presentation of chemical reactions. Ionic reactions are given in many texts to the exclusion of molecular reactions. Physical chemical theories are also frequently presented and discussed at great length.

The attempt has been made in the revision of this text to present only briefly the modern conceptions of solution, leaving a fuller presentation for the lecturer or separate texts on Physical Chemistry. Molecular reactions have also been largely retained in the belief that the material to be analyzed by the chemist, in practical work is quite as often a molecular compound as an ion.

All molecular weights, solubilities and other constants of the elements and their principal compounds have been brought up to date. The principal minerals, methods of preparation and determinations of elements, as well as the reactions, have been revised, references being given to the literature as heretofore.

In general, the attempt has been made to retain the excellent features of this text which have given it such an extended use in the past, both as a class room and as a reference text, while adding the valuable results of recent progress in the science.

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